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DebugInfo: Test linkonce-odr functions under LTO.

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This was previously regressed/broken by r192749 (reverted due to this
issue in r192938) and I was about to break it again by accident with
some more invasive changes that deal with the subprogram lists. So to
avoid that and further issues - here's a test.

It's a pretty basic test - in both r192749 and my impending case, this
test would crash, but checking the basics (that we put a subprogram in
just one of the two CUs) seems like a good start.

We still get this wrong in weird ways if the linkonce-odr function
happens to not be identical in the metadata (because it's defined in two
different files (hence the # line directives in this test), etc) even
though it meets the language requirements (identical token stream) for
such a thing. That results in two subprogram DIEs, but only one of them
gets the parameter and high/low pc information, etc. We probably need to
use the DIRef infrastructure to deduplicate functions as we do types to
address this issue - or perhaps teach the BC linker to remove the
duplicate entries in subprogram lists?

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209614 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2014-05-26 06:44:52 +00:00
parent 041b4abc73
commit bcc96923e0
1 changed files with 74 additions and 0 deletions
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74
test/DebugInfo/cross-cu-linkonce.ll Normal file
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; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; Built from source:
; $ clang++ a.cpp b.cpp -g -c -emit-llvm
; $ llvm-link a.bc b.bc -o ab.bc
; $ opt -inline ab.bc -o ab-opt.bc
; $ cat a.cpp
; # 1 "func.h"
; inline int func(int i) {
; return i * 2;
; }
; int (*x)(int) = &func;
; $ cat b.cpp
; # 1 "func.h"
; inline int func(int i) {
; return i * 2;
; }
; int (*y)(int) = &func;
; CHECK: DW_TAG_compile_unit
; CHECK: DW_TAG_subprogram
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "func"
; CHECK: DW_TAG_compile_unit
; CHECK-NOT: DW_TAG_subprogram
@x = global i32 (i32)* @_Z4funci, align 8
@y = global i32 (i32)* @_Z4funci, align 8
; Function Attrs: inlinehint nounwind uwtable
define linkonce_odr i32 @_Z4funci(i32 %i) #0 {
%1 = alloca i32, align 4
store i32 %i, i32* %1, align 4
call void @llvm.dbg.declare(metadata !{i32* %1}, metadata !20), !dbg !21
%2 = load i32* %1, align 4, !dbg !22
%3 = mul nsw i32 %2, 2, !dbg !22
ret i32 %3, !dbg !22
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata) #1
attributes #0 = { inlinehint nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!0, !13}
!llvm.module.flags = !{!17, !18}
!llvm.ident = !{!19, !19}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !10, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/a.cpp] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"a.cpp", metadata !"/tmp/dbginfo"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786478, metadata !5, metadata !6, metadata !"func", metadata !"func", metadata !"_Z4funci", i32 1, metadata !7, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32)* @_Z4funci, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [func]
!5 = metadata !{metadata !"func.h", metadata !"/tmp/dbginfo"}
!6 = metadata !{i32 786473, metadata !5} ; [ DW_TAG_file_type ] [/tmp/dbginfo/func.h]
!7 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !8, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!8 = metadata !{metadata !9, metadata !9}
!9 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!10 = metadata !{metadata !11}
!11 = metadata !{i32 786484, i32 0, null, metadata !"x", metadata !"x", metadata !"", metadata !6, i32 4, metadata !12, i32 0, i32 1, i32 (i32)** @x, null} ; [ DW_TAG_variable ] [x] [line 4] [def]
!12 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !7} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
!13 = metadata !{i32 786449, metadata !14, i32 4, metadata !"clang version 3.5.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !15, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/b.cpp] [DW_LANG_C_plus_plus]
!14 = metadata !{metadata !"b.cpp", metadata !"/tmp/dbginfo"}
!15 = metadata !{metadata !16}
!16 = metadata !{i32 786484, i32 0, null, metadata !"y", metadata !"y", metadata !"", metadata !6, i32 4, metadata !12, i32 0, i32 1, i32 (i32)** @y, null} ; [ DW_TAG_variable ] [y] [line 4] [def]
!17 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!18 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!19 = metadata !{metadata !"clang version 3.5.0 "}
!20 = metadata !{i32 786689, metadata !4, metadata !"i", metadata !6, i32 16777217, metadata !9, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [i] [line 1]
!21 = metadata !{i32 1, i32 0, metadata !4, null}
!22 = metadata !{i32 2, i32 0, metadata !4, null}